function md5(string) {
	function md5_RotateLeft(lValue, iShiftBits) {
		return (lValue << iShiftBits) | (lValue >>> (32 - iShiftBits));
	}

	function md5_AddUnsigned(lX, lY) {
		var lX4, lY4, lX8, lY8, lResult;
		lX8 = lX & 0x80000000;
		lY8 = lY & 0x80000000;
		lX4 = lX & 0x40000000;
		lY4 = lY & 0x40000000;
		lResult = (lX & 0x3fffffff) + (lY & 0x3fffffff);
		if (lX4 & lY4) {
			return lResult ^ 0x80000000 ^ lX8 ^ lY8;
		}
		if (lX4 | lY4) {
			if (lResult & 0x40000000) {
				return lResult ^ 0xc0000000 ^ lX8 ^ lY8;
			} else {
				return lResult ^ 0x40000000 ^ lX8 ^ lY8;
			}
		} else {
			return lResult ^ lX8 ^ lY8;
		}
	}

	function md5_F(x, y, z) {
		return (x & y) | (~x & z);
	}

	function md5_G(x, y, z) {
		return (x & z) | (y & ~z);
	}

	function md5_H(x, y, z) {
		return x ^ y ^ z;
	}

	function md5_I(x, y, z) {
		return y ^ (x | ~z);
	}

	function md5_FF(a, b, c, d, x, s, ac) {
		a = md5_AddUnsigned(
			a,
			md5_AddUnsigned(md5_AddUnsigned(md5_F(b, c, d), x), ac)
		);
		return md5_AddUnsigned(md5_RotateLeft(a, s), b);
	}

	function md5_GG(a, b, c, d, x, s, ac) {
		a = md5_AddUnsigned(
			a,
			md5_AddUnsigned(md5_AddUnsigned(md5_G(b, c, d), x), ac)
		);
		return md5_AddUnsigned(md5_RotateLeft(a, s), b);
	}

	function md5_HH(a, b, c, d, x, s, ac) {
		a = md5_AddUnsigned(
			a,
			md5_AddUnsigned(md5_AddUnsigned(md5_H(b, c, d), x), ac)
		);
		return md5_AddUnsigned(md5_RotateLeft(a, s), b);
	}

	function md5_II(a, b, c, d, x, s, ac) {
		a = md5_AddUnsigned(
			a,
			md5_AddUnsigned(md5_AddUnsigned(md5_I(b, c, d), x), ac)
		);
		return md5_AddUnsigned(md5_RotateLeft(a, s), b);
	}

	function md5_ConvertToWordArray(string) {
		var lWordCount;
		var lMessageLength = string.length;
		var lNumberOfWords_temp1 = lMessageLength + 8;
		var lNumberOfWords_temp2 =
			(lNumberOfWords_temp1 - (lNumberOfWords_temp1 % 64)) / 64;
		var lNumberOfWords = (lNumberOfWords_temp2 + 1) * 16;
		var lWordArray = Array(lNumberOfWords - 1);
		var lBytePosition = 0;
		var lByteCount = 0;
		while (lByteCount < lMessageLength) {
			lWordCount = (lByteCount - (lByteCount % 4)) / 4;
			lBytePosition = (lByteCount % 4) * 8;
			lWordArray[lWordCount] =
				lWordArray[lWordCount] |
				(string.charCodeAt(lByteCount) << lBytePosition);
			lByteCount++;
		}
		lWordCount = (lByteCount - (lByteCount % 4)) / 4;
		lBytePosition = (lByteCount % 4) * 8;
		lWordArray[lWordCount] =
			lWordArray[lWordCount] | (0x80 << lBytePosition);
		lWordArray[lNumberOfWords - 2] = lMessageLength << 3;
		lWordArray[lNumberOfWords - 1] = lMessageLength >>> 29;
		return lWordArray;
	}

	function md5_WordToHex(lValue) {
		var WordToHexValue = '',
			WordToHexValue_temp = '',
			lByte,
			lCount;
		for (lCount = 0; lCount <= 3; lCount++) {
			lByte = (lValue >>> (lCount * 8)) & 255;
			WordToHexValue_temp = '0' + lByte.toString(16);
			WordToHexValue =
				WordToHexValue +
				WordToHexValue_temp.substr(WordToHexValue_temp.length - 2, 2);
		}
		return WordToHexValue;
	}

	function md5_Utf8Encode(string) {
		string = string.replace(/\r\n/g, '\n');
		var utftext = '';
		for (var n = 0; n < string.length; n++) {
			var c = string.charCodeAt(n);
			if (c < 128) {
				utftext += String.fromCharCode(c);
			} else if (c > 127 && c < 2048) {
				utftext += String.fromCharCode((c >> 6) | 192);
				utftext += String.fromCharCode((c & 63) | 128);
			} else {
				utftext += String.fromCharCode((c >> 12) | 224);
				utftext += String.fromCharCode(((c >> 6) & 63) | 128);
				utftext += String.fromCharCode((c & 63) | 128);
			}
		}
		return utftext;
	}
	var x = Array();
	var k, AA, BB, CC, DD, a, b, c, d;
	var S11 = 7,
		S12 = 12,
		S13 = 17,
		S14 = 22;
	var S21 = 5,
		S22 = 9,
		S23 = 14,
		S24 = 20;
	var S31 = 4,
		S32 = 11,
		S33 = 16,
		S34 = 23;
	var S41 = 6,
		S42 = 10,
		S43 = 15,
		S44 = 21;
	string = md5_Utf8Encode(string);
	x = md5_ConvertToWordArray(string);
	a = 0x67452301;
	b = 0xefcdab89;
	c = 0x98badcfe;
	d = 0x10325476;
	for (k = 0; k < x.length; k += 16) {
		AA = a;
		BB = b;
		CC = c;
		DD = d;
		a = md5_FF(a, b, c, d, x[k + 0], S11, 0xd76aa478);
		d = md5_FF(d, a, b, c, x[k + 1], S12, 0xe8c7b756);
		c = md5_FF(c, d, a, b, x[k + 2], S13, 0x242070db);
		b = md5_FF(b, c, d, a, x[k + 3], S14, 0xc1bdceee);
		a = md5_FF(a, b, c, d, x[k + 4], S11, 0xf57c0faf);
		d = md5_FF(d, a, b, c, x[k + 5], S12, 0x4787c62a);
		c = md5_FF(c, d, a, b, x[k + 6], S13, 0xa8304613);
		b = md5_FF(b, c, d, a, x[k + 7], S14, 0xfd469501);
		a = md5_FF(a, b, c, d, x[k + 8], S11, 0x698098d8);
		d = md5_FF(d, a, b, c, x[k + 9], S12, 0x8b44f7af);
		c = md5_FF(c, d, a, b, x[k + 10], S13, 0xffff5bb1);
		b = md5_FF(b, c, d, a, x[k + 11], S14, 0x895cd7be);
		a = md5_FF(a, b, c, d, x[k + 12], S11, 0x6b901122);
		d = md5_FF(d, a, b, c, x[k + 13], S12, 0xfd987193);
		c = md5_FF(c, d, a, b, x[k + 14], S13, 0xa679438e);
		b = md5_FF(b, c, d, a, x[k + 15], S14, 0x49b40821);
		a = md5_GG(a, b, c, d, x[k + 1], S21, 0xf61e2562);
		d = md5_GG(d, a, b, c, x[k + 6], S22, 0xc040b340);
		c = md5_GG(c, d, a, b, x[k + 11], S23, 0x265e5a51);
		b = md5_GG(b, c, d, a, x[k + 0], S24, 0xe9b6c7aa);
		a = md5_GG(a, b, c, d, x[k + 5], S21, 0xd62f105d);
		d = md5_GG(d, a, b, c, x[k + 10], S22, 0x2441453);
		c = md5_GG(c, d, a, b, x[k + 15], S23, 0xd8a1e681);
		b = md5_GG(b, c, d, a, x[k + 4], S24, 0xe7d3fbc8);
		a = md5_GG(a, b, c, d, x[k + 9], S21, 0x21e1cde6);
		d = md5_GG(d, a, b, c, x[k + 14], S22, 0xc33707d6);
		c = md5_GG(c, d, a, b, x[k + 3], S23, 0xf4d50d87);
		b = md5_GG(b, c, d, a, x[k + 8], S24, 0x455a14ed);
		a = md5_GG(a, b, c, d, x[k + 13], S21, 0xa9e3e905);
		d = md5_GG(d, a, b, c, x[k + 2], S22, 0xfcefa3f8);
		c = md5_GG(c, d, a, b, x[k + 7], S23, 0x676f02d9);
		b = md5_GG(b, c, d, a, x[k + 12], S24, 0x8d2a4c8a);
		a = md5_HH(a, b, c, d, x[k + 5], S31, 0xfffa3942);
		d = md5_HH(d, a, b, c, x[k + 8], S32, 0x8771f681);
		c = md5_HH(c, d, a, b, x[k + 11], S33, 0x6d9d6122);
		b = md5_HH(b, c, d, a, x[k + 14], S34, 0xfde5380c);
		a = md5_HH(a, b, c, d, x[k + 1], S31, 0xa4beea44);
		d = md5_HH(d, a, b, c, x[k + 4], S32, 0x4bdecfa9);
		c = md5_HH(c, d, a, b, x[k + 7], S33, 0xf6bb4b60);
		b = md5_HH(b, c, d, a, x[k + 10], S34, 0xbebfbc70);
		a = md5_HH(a, b, c, d, x[k + 13], S31, 0x289b7ec6);
		d = md5_HH(d, a, b, c, x[k + 0], S32, 0xeaa127fa);
		c = md5_HH(c, d, a, b, x[k + 3], S33, 0xd4ef3085);
		b = md5_HH(b, c, d, a, x[k + 6], S34, 0x4881d05);
		a = md5_HH(a, b, c, d, x[k + 9], S31, 0xd9d4d039);
		d = md5_HH(d, a, b, c, x[k + 12], S32, 0xe6db99e5);
		c = md5_HH(c, d, a, b, x[k + 15], S33, 0x1fa27cf8);
		b = md5_HH(b, c, d, a, x[k + 2], S34, 0xc4ac5665);
		a = md5_II(a, b, c, d, x[k + 0], S41, 0xf4292244);
		d = md5_II(d, a, b, c, x[k + 7], S42, 0x432aff97);
		c = md5_II(c, d, a, b, x[k + 14], S43, 0xab9423a7);
		b = md5_II(b, c, d, a, x[k + 5], S44, 0xfc93a039);
		a = md5_II(a, b, c, d, x[k + 12], S41, 0x655b59c3);
		d = md5_II(d, a, b, c, x[k + 3], S42, 0x8f0ccc92);
		c = md5_II(c, d, a, b, x[k + 10], S43, 0xffeff47d);
		b = md5_II(b, c, d, a, x[k + 1], S44, 0x85845dd1);
		a = md5_II(a, b, c, d, x[k + 8], S41, 0x6fa87e4f);
		d = md5_II(d, a, b, c, x[k + 15], S42, 0xfe2ce6e0);
		c = md5_II(c, d, a, b, x[k + 6], S43, 0xa3014314);
		b = md5_II(b, c, d, a, x[k + 13], S44, 0x4e0811a1);
		a = md5_II(a, b, c, d, x[k + 4], S41, 0xf7537e82);
		d = md5_II(d, a, b, c, x[k + 11], S42, 0xbd3af235);
		c = md5_II(c, d, a, b, x[k + 2], S43, 0x2ad7d2bb);
		b = md5_II(b, c, d, a, x[k + 9], S44, 0xeb86d391);
		a = md5_AddUnsigned(a, AA);
		b = md5_AddUnsigned(b, BB);
		c = md5_AddUnsigned(c, CC);
		d = md5_AddUnsigned(d, DD);
	}
	return (
		md5_WordToHex(a) +
		md5_WordToHex(b) +
		md5_WordToHex(c) +
		md5_WordToHex(d)
	).toLowerCase();
}
module.exports.md5 = md5;
